125 lines
4.5 KiB
Text
125 lines
4.5 KiB
Text
version 2.4
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-----------
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- fixed remapping of bright colors when dithering
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- added libimagequant API to add fixed preset colors to the palette
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version 2.3
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-----------
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- added ./configure script for better support of Intel C compiler and dependencies [thanks to pdknsk]
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- tweaked quality metric to better estimate quality of images with large solid backgrounds [thanks to Rolf Timmermans]
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- atomic file saves and fixed --skip-if-larger
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- avoid applying quality setting to images that use palette already
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- preserving standard PNG chunks (requires libpng 1.6)
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- deprecated libpng 1.2 support
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version 2.2
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-----------
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- preserving of unknown PNG chunks (enables optimized Android 9-patch images)
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- improved color profile support: cHRM & gAMA as alternative to ICC profiles, OpenMP acceleration
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- improved support for Intel C Compiler, speedup in 32-bit GCC, and some workarounds for Visual Studio's incomplete C support
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version 2.1
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-----------
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- option to save files only if they're compressed better than the original
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- option to generate posterized output (for use with 16-bit textures)
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- support for ICC profiles via Little CMS library
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version 2.0
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-----------
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- refactored codebase into pngquant and standalone libimagequant
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- reduced memory usage by further 30% (and more for very large images)
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- less precise remapping improving speed by 25% in higher speed settings
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- --output option for writing converted file under the given path
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- light dithering with --floyd=0.5
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- fixed regression in dithering of alpha channel
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version 1.8
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-----------
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- min/max quality option (number of colors is automatically adjusted for desired quality level)
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- switched option parsing to getopt_long (syntax such as -s1 and --ext=ext is supported)
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- significantly improved performance thanks to custom partial sorting
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- optional Cocoa (Mac OS X) image reader for color profile support
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- reduced memory usage by 20%
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- remapping improved for very low number of colors
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version 1.7
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- new, accurate RGBA color similarity algorithm
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- change of optional SSE3 code to SSE2 that is always enabled on x86-64
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- optional OpenMP-based parallelisation of remapping
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- changed long options to use double hyphen (-force to --force) [thanks to Jari Aalto]
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version 1.6
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- novel dithering algorithm that doesn't add noise unless necessary
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- perceptual weighting of colors taking into account edges and noise
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- much faster remapping
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- improved portability, makefiles and man page
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version 1.5
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- palettes postprocessed with Voronoi iteration
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- better RGBA color similarity algorithm and Floyd-Steinberg remapping
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- SSE optimisations
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version 1.4
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- median cut is applied many times in a feedback loop
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- speed/quality trade-off option
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- faster remap of transparent areas
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version 1.3
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- significant changes to the algorithm: use of variance
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to find largest dimensioin and to split most varying boxes
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- use of premultiplied alpha for color blending
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- conversion of output to gamma 2.2
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version 1.2
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- color computation done in floating point
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- gamma correction applied
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- dropped support for very old systems & compilers
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version 1.1
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- alpha-sensitive color reduction and dithering
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- support -- and - arguments in command line
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- number of colors optional (defaults to 256)
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- increased maximum number of colors in histogram
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version 1.0
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- cleaned up Makefile.unx (better gcc optimizations, "clean" target)
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- recompiled binaries with zlib 1.1.4
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version 0.95
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------------
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- fixed Win32 filter bug (binary mode for stdin/stdout)
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- fixed cosmetic "choosing colors" verbosity buglet
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- fixed palette-size bug when number of colors in image < number requested
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- fixed sample-depth bug (png_set_packing() not retroactively smart)
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version 0.91
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------------
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- fixed some verbose/non-verbose oopers
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- fixed Win32 (MSVC) portability issues (getpid(), random(), srandom())
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- added Makefile.w32 for MSVC (tested with 5.0)
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version 0.90
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------------
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- added support for multiple files on command line
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- changed stdin support to write PNG stream to stdout (not "stdin-fs8.png")
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version 0.75
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------------
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- added support for any type of input file [Glenn Randers-Pehrson]
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- fixed palette-(re)scaling bug
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- added -verbose and -quiet options (default now is -quiet)
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- added palette-remapping to minimize size of tRNS chunk
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- made Floyd-Steinberg dithering default
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- changed output naming scheme to -fs8.png and -or8.png (FS or ordered dither)
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version 0.70
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------------
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- first public release
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